Language_Pack_Upgrader::check_package( string|WP_Error $source, string $remote_source ): string|WP_Error

Source

public function check_package( $source, $remote_source ) {
	global $wp_filesystem;

	if ( is_wp_error( $source ) ) {
		return $source;
	}

	// Check that the folder contains a valid language.
	$files = $wp_filesystem->dirlist( $remote_source );

	// Check to see if the expected files exist in the folder.
	$po  = false;
	$mo  = false;
	$php = false;
	foreach ( (array) $files as $file => $filedata ) {
		if ( str_ends_with( $file, '.po' ) ) {
			$po = true;
		} elseif ( str_ends_with( $file, '.mo' ) ) {
			$mo = true;
		} elseif ( str_ends_with( $file, '.l10n.php' ) ) {
			$php = true;
		}
	}

	if ( $php ) {
		return $source;
	}

	if ( ! $mo || ! $po ) {
		return new WP_Error(
			'incompatible_archive_pomo',
			$this->strings['incompatible_archive'],
			sprintf(
				/* translators: 1: .po, 2: .mo, 3: .l10n.php */
				__( 'The language pack is missing either the %1$s, %2$s, or %3$s files.' ),
				'<code>.po</code>',
				'<code>.mo</code>',
				'<code>.l10n.php</code>'
			)
		);
	}

	return $source;
}

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